restrictive usage
Linguistics term for a relative clause that restricts the referent of the noun it modifies, as opposed to non-restrictive usage (非制限用法).
See also: 非制限用法
English relative pronouns have restrictive and non-restrictive usage.
非制限用法 is the opposite term, referring to non-restrictive relative clauses that add extra information without limiting the noun's reference.
non-restrictive usage
Compound of 制限 (restriction) and 用法 (usage), a calque from English 'restrictive usage' in linguistics.